#include <linux/fs.h>
#include <linux/stat.h>
#include <asm/uaccess.h>
-#include <asm/segment.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/smp_lock.h>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-#include <linux/iobuf.h>
-#endif
#define DEBUG_SUBSYSTEM S_LLITE
int lt_get_mmap_locks(struct ll_lock_tree *tree,
unsigned long addr, size_t count);
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
struct page *ll_nopage(struct vm_area_struct *vma, unsigned long address,
int *type);
-#else
-
-struct page *ll_nopage(struct vm_area_struct *vma, unsigned long address,
- int unused);
-#endif
struct ll_lock_tree_node * ll_node_from_inode(struct inode *inode, __u64 start,
__u64 end, ldlm_mode_t mode)
*
* In 2.6, the truncate_count of address_space can cover this race.
*/
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
struct page *ll_nopage(struct vm_area_struct *vma, unsigned long address,
int *type)
-#else
-struct page *ll_nopage(struct vm_area_struct *vma, unsigned long address,
- int type /* unused */)
-#endif
{
struct file *filp = vma->vm_file;
struct ll_file_data *fd = LUSTRE_FPRIVATE(filp);
RETURN(NULL);
}
+ ll_clear_file_contended(inode);
+
/* start and end the lock on the first and last bytes in the page */
policy_from_vma(&policy, vma, address, CFS_PAGE_SIZE);
/* XXX change inode size without ll_inode_size_lock() held!
* there is a race condition with truncate path. (see
* ll_extent_lock) */
- /* region is within kms and, hence, within real file size (A).
+ /* XXX i_size_write() is not used because it is not safe to
+ * take the ll_inode_size_lock() due to a potential lock
+ * inversion (bug 6077). And since it's not safe to use
+ * i_size_write() without a covering mutex we do the
+ * assignment directly. It is not critical that the
+ * size be correct. */
+ /* region is within kms and, hence, within real file size (A).
* We need to increase i_size to cover the read region so that
* generic_file_read() will do its job, but that doesn't mean
* the kms size is _correct_, it is only the _minimum_ size.
* If someone does a stat they will get the correct size which
* will always be >= the kms value here. b=11081 */
if (i_size_read(inode) < kms) {
- i_size_write(inode, kms);
+ inode->i_size = kms;
CDEBUG(D_INODE, "ino=%lu, updating i_size %llu\n",
inode->i_ino, i_size_read(inode));
}
}
}
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
#ifndef HAVE_FILEMAP_POPULATE
static int (*filemap_populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
#endif
rc = filemap_populate(area, address, len, prot, pgoff, 1);
RETURN(rc);
}
-#endif
/* return the user space pointer that maps to a file offset via a vma */
static inline unsigned long file_to_user(struct vm_area_struct *vma, __u64 byte)
}
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-/* [first, last] are the byte offsets affected.
- * vm_{start, end} are user addresses of the first byte of the mapping and
- * the next byte beyond it
- * vm_pgoff is the page index of the first byte in the mapping */
-static void teardown_vmas(struct vm_area_struct *vma, __u64 first,
- __u64 last)
-{
- unsigned long address, len;
- for (; vma ; vma = vma->vm_next_share) {
- if (last >> CFS_PAGE_SHIFT < vma->vm_pgoff)
- continue;
- if (first >> CFS_PAGE_SHIFT >= (vma->vm_pgoff +
- ((vma->vm_end - vma->vm_start) >> CFS_PAGE_SHIFT)))
- continue;
-
- /* XXX in case of unmap the cow pages of a running file,
- * don't unmap these private writeable mapping here!
- * though that will break private mappping a little.
- *
- * the clean way is to check the mapping of every page
- * and just unmap the non-cow pages, just like
- * unmap_mapping_range() with even_cow=0 in kernel 2.6.
- */
- if (!(vma->vm_flags & VM_SHARED) &&
- (vma->vm_flags & VM_WRITE))
- continue;
-
- address = max((unsigned long)vma->vm_start,
- file_to_user(vma, first));
- len = min((unsigned long)vma->vm_end,
- file_to_user(vma, last) + 1) - address;
-
- VMA_DEBUG(vma, "zapping vma [first="LPU64" last="LPU64" "
- "address=%ld len=%ld]\n", first, last, address, len);
- LASSERT(len > 0);
- ll_zap_page_range(vma, address, len);
- }
-}
-#endif
-
/* XXX put nice comment here. talk about __free_pte -> dirty pages and
* nopage's reference passing to the pte */
int ll_teardown_mmaps(struct address_space *mapping, __u64 first, __u64 last)
ENTRY;
LASSERTF(last > first, "last "LPU64" first "LPU64"\n", last, first);
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
if (mapping_mapped(mapping)) {
rc = 0;
unmap_mapping_range(mapping, first + CFS_PAGE_SIZE - 1,
last - first + 1, 0);
}
-#else
- spin_lock(&mapping->i_shared_lock);
- if (mapping->i_mmap != NULL) {
- rc = 0;
- teardown_vmas(mapping->i_mmap, first, last);
- }
- if (mapping->i_mmap_shared != NULL) {
- rc = 0;
- teardown_vmas(mapping->i_mmap_shared, first, last);
- }
- spin_unlock(&mapping->i_shared_lock);
-#endif
+
RETURN(rc);
}
.nopage = ll_nopage,
.open = ll_vm_open,
.close = ll_vm_close,
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
.populate = ll_populate,
-#endif
};
int ll_file_mmap(struct file * file, struct vm_area_struct * vma)
ll_stats_ops_tally(ll_i2sbi(file->f_dentry->d_inode), LPROC_LL_MAP, 1);
rc = generic_file_mmap(file, vma);
if (rc == 0) {
-#if !defined(HAVE_FILEMAP_POPULATE) && \
- (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
+#if !defined(HAVE_FILEMAP_POPULATE)
if (!filemap_populate)
filemap_populate = vma->vm_ops->populate;
#endif
git://git.whamcloud.com / fs / lustre-release.git / blobdiff